1 files changed, 85 insertions, 0 deletions
diff --git a/libs/hwui/thread/ThreadBase.h b/libs/hwui/thread/ThreadBase.h
new file mode 100644
index 000000000000..8068121f64cf
--- /dev/null
+++ b/libs/hwui/thread/ThreadBase.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef HWUI_THREADBASE_H
+#define HWUI_THREADBASE_H
+
+#include "WorkQueue.h"
+#include "utils/Macros.h"
+
+#include <utils/Looper.h>
+#include <utils/Thread.h>
+
+#include <algorithm>
+
+namespace android::uirenderer {
+
+class ThreadBase : protected Thread {
+    PREVENT_COPY_AND_ASSIGN(ThreadBase);
+
+public:
+    ThreadBase()
+            : Thread(false)
+            , mLooper(new Looper(false))
+            , mQueue([this]() { mLooper->wake(); }, mLock) {}
+
+    WorkQueue& queue() { return mQueue; }
+
+    void requestExit() {
+        Thread::requestExit();
+        mLooper->wake();
+    }
+
+    void start(const char* name = "ThreadBase") { Thread::run(name); }
+
+    void join() { Thread::join(); }
+
+protected:
+    void waitForWork() {
+        nsecs_t nextWakeup;
+        {
+            std::unique_lock lock{mLock};
+            nextWakeup = mQueue.nextWakeup(lock);
+        }
+        int timeout = -1;
+        if (nextWakeup < std::numeric_limits<nsecs_t>::max()) {
+            timeout = ns2ms(nextWakeup - WorkQueue::clock::now());
+            if (timeout < 0) timeout = 0;
+        }
+        int result = mLooper->pollOnce(timeout);
+        LOG_ALWAYS_FATAL_IF(result == Looper::POLL_ERROR, "RenderThread Looper POLL_ERROR!");
+    }
+
+    void processQueue() { mQueue.process(); }
+
+    virtual bool threadLoop() override {
+        while (!exitPending()) {
+            waitForWork();
+            processQueue();
+        }
+        return false;
+    }
+
+    sp<Looper> mLooper;
+
+private:
+    WorkQueue mQueue;
+    std::mutex mLock;
+};
+
+}  // namespace android::uirenderer
+
+#endif  // HWUI_THREADBASE_H